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CVE-2025-4451: Critical Buffer Overflow Vulnerability in D-Link DIR-619L

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Overview

The Common Vulnerability and Exposure (CVE) system has recently identified a severe security flaw in the D-Link DIR-619L routers, specifically version 2.04B04. This vulnerability, designated as CVE-2025-4451, has been classified as critical due to its potential for system compromise or data leakage. The affected function, formSetWAN_Wizard52, can be manipulated remotely, posing a significant risk to users of the outdated firmware. This issue underscores the importance of maintaining up-to-date hardware and software as a first line of defense against cyber threats.

Vulnerability Summary

CVE ID: CVE-2025-4451
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

D-Link DIR-619L | 2.04B04

How the Exploit Works

The vulnerability is located in the formSetWAN_Wizard52 function of D-Link DIR-619L 2.04B04. An attacker can trigger a buffer overflow by manipulating the ‘curTime’ argument in the function call. Buffer overflow vulnerabilities occur when a program writes more data to a fixed-length block of memory, or buffer, than it can hold. The extra data can overwrite adjacent memory, leading to erratic program behavior, crashes, or even the execution of malicious code. In this case, an attacker could leverage the overflow to gain control over the system or extract sensitive data.

Conceptual Example Code

While we do not have the exact code, an example of how this vulnerability might be exploited is provided below. In this hypothetical scenario, an attacker sends a specially crafted HTTP request to the router’s WAN settings page, overloading the buffer with an excessive ‘curTime’ value.

POST /formSetWAN_Wizard52 HTTP/1.1
Host: target_router_ip
Content-Type: application/json
{ "curTime": "A long string of text to trigger a buffer overflow..." }

The above is a conceptual example and may not reflect the exact method an attacker would use to exploit this vulnerability. It is shared merely for illustrative and educational purposes.
Please note that the vendor has been notified of this vulnerability, and users are urged to apply the vendor patch or use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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